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Published In: Plantarum Novarum ex Herbario Sprengelii Centuriam 42–43. 1807. (May 1807) (Pl. Nov. Herb. Spreng.) Name publication detail

Project Name Data (Last Modified On 2/22/2011)
Acceptance : Accepted
Project data     (Last Modified On 2/22/2011)

Bryum weigelii has elongate stems with pale, widely spaced, soft, contorted, very long‑decurrent leaves. Despite its widely spaced leaves the leaf decurrencies in this species often extend into the axils of the leaves next below. Its costae are usually subpercurrent, its leaf cells lax, thin‑walled, and frequently bulging, and its margins are plane and indistinctly bordered. Bryum weigelii is a widespread, Northern Hemispheric species known in North America as far south as Texas. The species has been reported in the Southern Hemisphere only from Kerguelen (Ochi 1972). As noted by Andrews (1940) “Elongated sterile forms of various other species showing slightly decurrent leaves are often confused with it.”

Illustrations: Schwaegrichen (1816, Pl. 79, as Mnium Davalia); Bruch and Schimper (1839, Pl. 371 as Bryum Davalia); Dixon and Jameson (1896, Pl. 43 K, as B. Davalia); Grout (1906, Fig. 111, as B. Davalia); Brotherus (1923, Fig. 49 A–B, as B. Davalia); Mönkemeyer (1927, Fig. 103 g, as B. Davalia); Andrews (1940, Pl. 89B); Nyholm (1958, Fig. 117); Abramova et al. (1961 Pl. 171 4–6); Lawton (1971, Pl. 96 5–10); Ochi (1972, Fig. 56 F–H); Smith (1978, Fig. 186 8–9); Crum and Anderson (1981, Fig. 255 A–F); Ireland (1982, Pl. 173 1–9); Orbán and Vajda (1983, Pl. 55 360); Noguchi (1988, Fig. 204B f–i); Nyholm (1993, Fig. 144); Allen (1995, Fig. 11 a–g); Jóhannsson (1995, Fig. 54). Figure 154.
Habitat: On soil and rocks along streams, in seepage areas, or in springs; 1750 m.
Distribution in Central America: COSTA RICA. San José: Crosby 9721 (MO).
World Range: Subarctic America, Western and Eastern Canada, Northwestern, North‑Central, Northeastern, Southwestern, and South‑Central U.S.A.; Central America; Northern, East, Southwestern, Middle, and Southeastern Europe; Siberia, Russian Far East, Caucasus, Middle Asia, Eastern and Western Asia; Indian Subcontinent; Subantarctic Islands.


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Bryum weigelii Spreng., Mant. Prim. Fl. Hal. 55. 1807.

Protologue: Czech Republic/Poland. In Sudeticis montibus ad pagum Roth–Zechau invenit Weigelius.

Plants large, pale‑green to yellowish green, in soft, loose tufts, 30–50 mm high; rhizoids sparse. Leaves 2–3. mm long, widely spaced, soft, shriveled and twisted when dry, erect‑spreading when wet, ovate to ovate‑lanceolate, long‑decurrent; apices acute to short-acuminate; margins plane or weakly recurved below, border indistinct, entire; costae subpercurrent to percurrent; upper cells irregularly oblong‑hexagonal, lax and thin‑walled 30–50 x 12–24 μm, basal cells irregularly rectangular, lax and thin‑walled, 34–60 x 14–24 μm. Dioicous. Sporophytes not known from Central America. Setae 35–45 mm long, red. Capsules 3 mm long, pyriform, pendent; opercula conic‑apiculate, 0.5 mm long; exostome brownish yellow, papillose, endostome yellowish hyaline, basal membrane to ½ of exostome teeth length, segments long, broadly perforate, lightly papillose, cilia 2–3, appendiculate. Spores 10–14 μm, lightly papillose (Allen 1995).



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